// from http://jerry.cs.uiuc.edu/~plop/plop99/proceedings/sandu/sandu.pdf
import java.util.Vector;
import java.util.Comparator;
import java.util.Collections;

class Main {
  static public void main( String[] args ){

Vector collection = new Vector();
collection.add(new Integer(4));
collection.add(new Integer(2));
collection.add(new Integer(1));
collection.add(new Integer(3));

Comparator comparator = new Comparator() {
public int compare(Object source, Object target) {
int sourceInt = ((Integer)source).intValue();
int targetInt = ((Integer)target).intValue();
return(sourceInt<targetInt ? -1
: (sourceInt==targetInt ? 0 : 1));
}};

Collections.sort(collection, comparator);
System.out.println(collection);

}}

// Yields: [1, 2, 3, 4]